Index: branches/apertium-tagger/experiments/experiments.py
===================================================================
--- branches/apertium-tagger/experiments/experiments.py	(revision 71574)
+++ branches/apertium-tagger/experiments/experiments.py	(revision 71575)
@@ -1,7 +1,7 @@
 from collections import defaultdict
 import re
 import functools
-from os.path import join as pjoin
+from os.path import abspath, dirname, join as pjoin
 from statistics import mean, stdev
 
 from evaluate_tagger import TaggerEvaluator
@@ -10,6 +10,7 @@
                             tagger_train_percep)
 
 
+MODULE_PATH = abspath(dirname(__file__))
 NUM_KV_REGEX = re.compile(r'(\D+)(\d+)')
 KV_REGEX = re.compile(r'([^-]+)-([^-]+)')
 BOOL_OPTIONS = ['cg', 'sup']
@@ -294,7 +295,7 @@
 @reg('percep')
 @xval_experiment
 def percep_experiment(lab, xval_fns, cg, mtx, **kwargs):
-    mtx_fn = 'mtx/' + mtx + '.mtx'
+    mtx_fn = pjoin(MODULE_PATH, 'mtx', + mtx + '.mtx')
 
     tagger_train_percep(xval_fns['model'],
                         train_fn=xval_fns['train'],